Anyone experiencing MSN rendering strangely sandboxed?

XP SP3 Sb 3.62. Since yesterday, MSN opens in what appears to be html unless that site has been previously opened un-sandboxed. This was happening with Sb v3.6 also. As long as I don't clean the disk with CCleaner, it will render perfectly all day even though the Sb contents are set to delete when Ff is closed. This is how I always browse though. Once or twice/day I'll run CC. I'm going to disable the HTTPS - Everywhere extension in Ff, as I just remembered there being a problem with that once before, and see if that has anything to do with it, although like I said it renders fine not sandboxed. Thank you!

I edit: I just disabled that extension via Ff un-sandboxed, ran Cc then started a new sandboxed session but sure enough msn rendered weird again. I'll post this problem on Wilders too and see if anyone else is experiencing it!
I edit again: Well I fixed it! Hard to believe how programs can conflict. I discovered that the Garmin (GPS) lifetime map updater was in my startup programs. I don't understand why it writes to there. I disabled it from starting and now everything seems normal!